MAHMOODI, N.O., M. MAMAGHANI, K. TABATABAEIAN, and M. RAHIMPOUR. 2010. “Acylation of Pyrrole and Investigation of Direct Γ-Butyrolactone Reactions”. Asian Journal of Chemistry 19 (2):1349-57. https://asianpubs.org/index.php/ajchem/article/view/20253.